David Seyfort Ruegg (August 1, 1931 – February 2, 2021) was an eminent American-British Buddhologist with a long career, extending from the 1950s to the present. His specialty was Madhyamaka philosophy, a core doctrine of Mahayana Buddhism. Education Ruegg graduated from École des Hautes Etudes in 1957, with degrees in historical science and Sanskrit. He published his thesis "Contributions à l'histoire de la philosophie linguistique indienne" ("Contributions to the History of Indian Linguistic Philosophy") in 1959. He received a second doctorate in linguistics from the Sorbonne in Paris, where his thesis was "La théorie du tathâgatagarbha et du gotra : études sur la sotériologie et la gnoséologie du bouddhisme" ("The Theory of Gotra and Tathâgatagarbha: A Study of the Soteriology and Gnoseology of Buddhism"), with a second half thesis on Buton Rinchen Drub's approach to tathâgatagarbha. Career Ruegg joined the faculty of the Ecole Francaise d'Extreme Orient in 1964, where he researched the history, philology and philosophy of India, Tibet and Buddhism. From 1966 to 1972, Ruegg occupied the Chair of Languages and Cultures of India and Tibet at Leiden University. His predecessor was Jan Willem de Jong and his successor was Tilmann Vetter. He then became associated with the School of Oriental and African Studies, University of London. Ruegg was president of the International Association of Buddhist Studies (IABS) from 1991 to 1999. L. S. Cousins called Ruegg "certainly the leading scholar today" on the subject of tathâgatagarbha doctrine. Death Ruegg died from complications of COVID-19 in London on February 2, 2021, during the COVID-19 pandemic in England. He was 89. Publications Contributions à l'histoire de la philosophie linguistique indienne, Paris, Éd. de Boccard (Public. de l'Institut de civilisation indienne, 7). 1959 The life of Bu ston Rin po che, Roma, Istituto Italiano per il Medio ed Estremo Oriente. 1966 The study of Indian and Tibetan thought: some problems and perspectives, Inaugural lecture, Chair of Indian Philosophy, Buddhist Studies and Tibetan, University of Leiden, E. J. Brill. 1967 La théorie du tathâgatagarbha et du gotra : études sur la sotériologie et la gnoséologie du bouddhisme, Paris, EFEO (PEFEO, 70). 1969 Le traité du tathâgatagarbha de Bu ston Rin chen grub, Paris, EFEO (PEFEO, 88). 1973 The literature of the Madhyamaka school of philosophy in India, Wiesbaden, Otto Harrassowitz (History of Indian Literature, 7/1). 1981 Buddha-nature, Mind and the problem of Gradualism in a comparative perspective: On the transmission and